She's been too frightened, she says, after at least four dissidents of Chinese origin were arrested or simply disappeared from Thailand in the last four months... only to resurface back in China in the custody of the government.

Yu is a pro-democracy activist who fled to Thailand last year to escape government repression in China.

"I thought I would get protection in Bangkok, that I wouldn't have to live in fear of being arrested all the time," she says, bursting into tears. Now she lives in fear of being snatched off the streets by Chinese agents.

For decades, critics of China's ruling communist party have sought refuge in Thailand. But now it appears even foreign countries aren't safe for political dissidents seeking to escape the long arm of the Chinese law.

A new pattern suggests Beijing is cracking down on critics beyond Chinese borders, not only in Thailand, but also in the autonomous former British colony of Hong Kong, where Chinese security services are not supposed to have legal jurisdiction.

Swedish publisher disappears

Observers are most alarmed by the mysterious disappearance of a Swedish national of Chinese origin.

Gui Minhai is a part owner of a Hong Kong-based company that publishes gossipy books about China's elite.

He was last seen in Thailand on October 17, driving out of the condominium complex where he owns an apartment in the resort of Pattaya. Thai police tell CNN they have no record of Gui leaving the country.

A police official in Thailand, speaking to CNN on condition of anonymity due to the sensitivity of the case, says Thai authorities are now working with Swedish officials to investigate Gui's possible kidnapping.

Officials in Beijing continue to insist that Gui voluntarily handed himself over to Chinese authorities.

"He turned himself in to Chinese police," foreign ministry spokesman Lu Kang said on Tuesday.

"Trust that other governments will not break their own laws to cooperate with China," he added.

Adding to the mystery is an unusual visit to Gui's apartment on November 3 -- long after he disappeared -- by four unidentified men.

Gui's maid Pisamai Phumulna told CNN they carried a letter in English, purportedly written by Gui, authorizing them to visit his room and take his computer.

She said the men appeared friendly. Only two of them spoke Thai, albeit with thick Chinese accents. Footage from the Silver Beach Condominium complex's security camera captured the face and short-cropped hair of one of these mysterious visitors.

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Series of disappearances

At least four Hong Kong-based employees and business partners from Gui's publishing company Mighty Current have also disappeared in recent months.

Critics accuse Chinese security services of abducting at least one of the book sellers in Hong Kong and dragging him back into mainland China.

News of British bookstore owner Lee Bo's disappearance in January sparked street protests and a police investigation in Hong Kong.

The U.S. and Britain have both expressed concern about Gui, Lee, and three other missing book sellers.

Veteran China expert Mike Chinoy argues Beijing is sending a political message, especially when Chinese authorities parade former exiles on state television.

"This is really the first time that we've seen in such an over flagrant way -- irrespective of the international fallout -- that the Chinese government and security services have been going around and literally just taking people from other countries and spiriting them back to China," says Chinoy, senior fellow at the USC U.S.-China Institute.

Photos:China's international hunt for dissidents

China's international hunt for dissidents – For critics of China and their families, fears that nowhere is safe as Beijing targets dissidents beyond its borders.

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Photos:China's international hunt for dissidents

Gui Minhai – This Chinese-born Swede, right, ran publishing house Mighty Current in Hong Kong, known for printing political gossip about the Chinese leadership. He disappeared from his apartment in Thailand on October 17. Three months later, he suddenly appeared on Chinese state television, confessing to a 2003 hit and run. His supporters say he was kidnapped by Chinese agents and the Thai police tell CNN they have no record of him leaving the country.

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Photos:China's international hunt for dissidents

Lee Bo – Gui Minhai's business partner, Lee Bo was last seen on December 30 near his company's warehouse in Hong Kong. Hong Kong police have since confirmed he is in mainland China. Lee's disappearance sparked demonstrations in Hong Kong, where protestors believe his arrest was a violation of the former colony's autonomy. Lee and Gui's supporters say Mighty Current was working on a book about the love affairs of Chinese President Xi Jinping. UK authorities say they are "deeply concerned" about the possible detention of Lee, a British passport holder, and his colleagues.

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Photos:China's international hunt for dissidents

Li Xin – The former editor of a prominent Chinese newspaper, Li said he was pressured by local authorities to spy on human rights advocates and NGOs. He tried to seek asylum in India and then Thailand. After speaking to his wife from a train near the Thai-Laos border on January 11, he disappeared for more than three weeks. His wife told CNN the two next spoke on the phone on February 3. Li refused to disclose his location and told her he "voluntarily came back to China to accept an investigation."

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Photos:China's international hunt for dissidents

Dong Guangping – A former Chinese police officer, Dong was arrested several times for participating in pro-democracy protests. He fled to Thailand with his family in 2015 seeking safety from Chinese authorities and a better life for his daughter, according to his wife Gu Shuhua. Despite UN recognition as a refugee, the Thai authorities arrested him in October for an immigration violation. Gu says her husband's immigration fine was paid by the Chinese government who then took him back to China. Since his arrest in Bangkok, she says her only contact with Dong has been seeing him in police custody on Chinese state television.

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Photos:China's international hunt for dissidents

Jiang Yefei – A political cartoonist and leader in the Chinese dissident community in Thailand, Jiang Yefei, right, was arrested alongside Dong Guangping in Bangkok and sent to China. Amnesty International says he fled China after being detained and tortured because of his criticism of the government's response to the 2008 Sichuan earthquake. He appeared imprisoned on Chinese state television in November, asking for "lenient treatment."

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Photos:China's international hunt for dissidents

Bao Zhuoxuan – A 16-year-old student, Bao fled China after the detention of his parents in a government crackdown on human rights lawyers. Amnesty International says he and his traveling companions were picked up in the Myanmar border town of Mong La on October 6 and returned to China. Rights groups say he is now under house arrest at his grandparents' house in Inner Mongolia. Chinese state media denied reports the boy has been threatened or harassed and said he is enrolled in local school.

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Fear and paranoia

The disappearances and arrests have certainly struck fear into the heart of the small Chinese dissident exile community in Thailand.

Several pro-democracy activists who fled repression in China told CNN they no longer feel safe in the Thai capital.

"I avoid telling any Chinese person where I live," says a dissident writer named Yi Feng. Every time he steps out onto the street, Yi says he's on the look-out for anyone who appears to be Chinese.

They also fear arrest and extradition by the Thai authorities.

Last October, two members of a small exile Chinese opposition political party -- Jiang Yefei and Dong Guangping -- were arrested by Thai police.

Several weeks later, despite protests from the United Nations High Commissioner for Refugees, the two men were extradited to China and promptly thrown in prison.

Family devastated

Dong Guangping, left, with his wife Gu Shuhua, and daughter in Bangkok on October 7, 2015 after handing in documents to the UNHCR.

Since the extradition of Dong, his wife, Gu Shuhua, and daughter fled Thailand for Canada. Speaking from Toronto, she says Dong's capture has devastated her small family.

"The Chinese government put pressure on my husband for so long that he ran away [from China]. Why did they still need to chase us?" she asks, visibly shaking with grief and anger.

Gu's husband was a police officer from a military family in Henan province. In the 1990s, he began publishing letters criticizing the Chinese government.

"Early on, he was aware of what the Chinese Communist Party's dictatorship was doing to the country," she says. "He worked in the security department, so he witnessed a lot of unjust events and policies that he did not agree with."

In 2000, she says her husband was sentenced to three years in prison for his political activities.

After his release, he engaged in further protests against Beijing.

In some cases, Dong broke strict taboos by demonstrating to commemorate victims of the deadly 1989 crackdown in Tiananmen Square. Any mention of the deadly events of June 4, 1989 is strictly censored in China.

After yet another arrest in 2014, the couple finally decided to move with their daughter to Bangkok to escape mounting pressure from Chinese authorities.

"I thought Thailand would be better," Gu says.

Chinese dissidents Yu Yanhua, left, and Yan Bojun pose with their U.N. asylum seeker documents from the UNHCR in Bangkok. They fled China together for safety in Thailand but now fear their government will come after them even outside of its borders.

'I lost my mind'

On October 28, 2015, Gu received a call saying her husband had been arrested along with Jiang by police in Bangkok. Dong was charged with entering the country without a passport.

Supporters launched a campaign to grant the men protected United Nations political refugee status.

Soon after, Gu says Dong received his U.N. refugee identification. On November 11th, she said Canada agreed to grant the family fast-track asylum. The couple enjoyed a happy visit the next day at the facility where Dong was incarcerated.

And then Jiang and Dong were both suddenly shipped back to China.

"When I heard from the U.N. that my husband was taken back to China, I lost my mind," Gu says.

The UNHCR issued a statement on November 17, expressing deep concern about the two refugees who were supposed to be provided international protection.

The timing of the extradition was particularly alarming since it took place just days before the two men were scheduled to depart for North America.

"This action by Thailand is clearly a serious disappointment," the UNHCR said.

Soon after, both Jiang and Dong appeared on Chinese state television being interrogated by Chinese police.

Fellow dissidents in Bangkok said Jiang had been instrumental in helping at least half a dozen political dissidents escape over the years from China to Thailand.

Gu has struggled with her daughter to attract attention to her husband's case, staging small protests outside the Chinese Consulate in Toronto.

She says she has not been allowed to speak to her husband since he was taken to China in November.

"I hope he will take care of his health," she says, sobbing. "I hope our family can reunite soon."